This is a quick list of “sustainable resources”, stuff which you can farm and sell to make money.

Be sure to stop by the merchants before you do any alchemy, especially if you have picked up any non-renewable resources. Minerals can be sold for much more than the herbal ingredients that perform the same function.

Instead of buying higher quality potion bases, mix White Gull.

Food varies in price but perform the same function. Sell any foods you have worth 4 orens or more. 1 oren food can be used for gifts/quests. The others can be traded for Mistletoe.

After you get to Vizima, though, you really shouldn’t need money any more.

Outskirts

The book The Tome of Fear and Loathing, volume I (250 orens) can won from a drinking contest with a drunkard in the tavern.

The book Swamp Monsters (200 orens) can be found in a house in the village before the main village.